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Acquisitions (Details Textual) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Mar. 31, 2014 Aggregate Year to Date Acquisitions | Dec. 31, 2013 Aggregate Year to Date Acquisitions | Mar. 31, 2014 Aggregate Year to Date Acquisitions Luntz Global Partners L L C | Mar. 31, 2014 Aggregate Year to Date Acquisitions Kingsdale Partners LP | Dec. 31, 2013 Aggregate Year to Date Acquisitions Local Biz Now LLC
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
business acquisition, current period revenue | $ 10,480 |  | $ 16,141 |  |  |  |  |  |
business acquisition, current period net income | 3,456 |  | 4,085 |  |  |  |  |  |
Business Acquisition, Increase (Decrease) In Contingent Purchase Price Obligation | 4,071 | 2,387 | 12,093 | 4,683 |  |  |  |  |
Business Acquisition, Cost of Acquired Entity, Purchase Price |  |  |  |  | 100,574 | 38,202 |  |  |
Business Acquisition, Cost of Acquired Entity, Cash Paid |  |  |  |  | 43,315 | 12,000 |  |  |
Business Acquisition, Deferred Acquisition Consideration |  |  |  |  | 57,259 | 26,202 |  |  |
Business Acquisition, Purchase Price Allocation, Amortizable Intangible Assets |  |  |  |  | 24,374 | 10,835 |  |  |
Business Acquisition, Purchase Price Allocation, Goodwill Amount |  |  |  |  | 135,651 | 35,956 |  |  |
Nonredeemable Noncontrolling Interest |  |  |  |  | 61,517 |  |  |  |
Redeemable Noncontrolling Interest, Equity, Carrying Amount |  |  |  |  |  | 11,090 |  |  |
Business Acquisition Purchase Price Allocation Intangibles and Goodwill Expected Tax Deductible Amount |  |  |  |  | $ 101,290 | $ 46,791 |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 100.00% |  | 100.00% |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  |  |  | 60.00% | 65.00% | 70.00%

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